Heise PTE-1, Operating Manual

Page: 27 / 80

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Revision 4.6 3/2004
Step 3 With the desired unit of measure fl ashing, press
the enter key.
ENT
After pressing the enter key the HHC will resume mea-
suring fl ow volume in the selected unit of measure.
Section 14.6 Simultaneous Display of Two Flow
Measurements in Independent
Engineering Units
The HHC can display fl ow measurement data from two
installed Quick Select pressure modules in independent
engineering units. In order to display two different engi-
neering units simultaneously the following procedure
should be followed. In this example we will assume the
operator is in the fl ow velocity mode and would like to
present the measured values in ft/min on the right side of
the display and meters/second on the left side of the display.
Step 1 With the HHC on and displaying fl ow (velocity
or volume) measurement data from two Quick Select
pressure modules press the engineering unit key, desig-
nated ENG UNIT.
ENG
UNIT
When in the fl ow velocity mode the engineering unit
selection is:
ft/min ft/sec
MPH MeterSec
When in the fl ow volume mode the engineering unit
selection is:
ft3/min ft3/sec
m3/min m3/Sec
Step 2 Using the arrow keys select either of the two
desired engineering units. For this example we will
select ft/min fi rst.
ft/min ft/sec
MPH MeterSec
Step 3 With one of the two engineering units to be
used selected and fl ashing, in this example ft/min, press
the enter key.
ENT
The HHC will respond by returning to the fl ow measure-
ment mode and will display the measurement data as
follows:
ft/min ft/min
+12345 +12345
W = width of the duct in inches
H = height of the duct in inches
For round ducts:
area (square inches) = (
π
/4 )D 2
where:
π
= 3.141592
D = diameter of the duct in inches
Step 5 Using the number keys input the area value
calculated in Step 4.
Enter Duct Area
sq.in. 123456
Step 6 With the appropriate area value displayed press
the enter key.
ENT
If an incorrect area value is keyed press the clear entry
(CE) key to reenter the required data.
The HHC will now be set up to provide fl ow volume
measurement data for the desired duct.
To Exit Flow Volume Measurement and Return to
Basic Pressure Measurement Press the Clear Entry
Key (CE).
Section 14.5 Engineering Units for Flow Volume
As with standard pressure measurement the HHC can
provide fl ow volume measurements in a variety of units
of measure. To select a unit of measure for fl ow velocity
follow the steps below.
Step 1 With the HHC operating in the fl ow volume
mode (refer to Section 14.4 for instructions on entering
the fl ow volume mode) press the engineering unit key,
designated ENG UNIT on the keypad.
ENG
UNIT
The HHC will respond by displaying the following:
ft3/min ft3/sec
m3/min m3/Sec
These are the 6 units of measure available for display of
fl ow volume.
Step 2 Using the arrow keys select the desired unit of
measure. When selected the unit of measure will fl ash.
In this example the engineering unit of ft3/sec unit has
been selected.
ft3/min ft3/sec
m3/min m3/sec